iRhythm Ownership | Who Owns iRhythm?

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iRhythm Ownership Summary

iRhythm is owned by 112.03% institutional investors, 0.96% insiders. Vanguard group is the largest institutional shareholder, holding 10.03% of IRTC shares. Sands Capital Global Growth Equity is the top mutual fund, with 8.25% of its assets in iRhythm shares.

IRTC Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	iRhythm	112.03%	0.96%	-12.99%
Sector	Healthcare Stocks	487.91%	11.08%	-398.99%
Industry	Medical Device Stocks	52.25%	10.55%	37.19%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Vanguard group	3.14M	10.03%	$282.81M
Sands capital management	2.92M	9.23%	$448.87M
Blackrock funding, inc. /de	2.75M	8.70%	$423.33M
Artisan partners limited partnership	2.74M	8.68%	$421.98M
Blackrock	2.50M	8.03%	$269.35M
Capital research global investors	1.51M	4.77%	$232.00M
State street	896.85K	2.88%	$96.54M
Geode capital management	731.47K	2.34%	$65.97M
Bnp paribas asset management	734.62K	2.33%	$113.10M
Champlain investment partners	726.26K	2.32%	$65.49M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Ophir asset management pty	202.08K	4.50%	$28.31M
First light asset management	187.35K	3.74%	$28.85M
Kampmann melissa s.	23.89K	3.00%	$4.11M
Next century growth investors	224.86K	2.67%	$34.62M
Rock springs capital management lp	242.50K	2.33%	$37.34M
Semanteon capital management, lp	9.95K	2.31%	$1.53M
Eventide asset management	691.57K	1.87%	$106.48M
Healthinvest partners ab	25.30K	1.67%	$3.90M
Braidwell lp	300.03K	1.58%	$46.19M
Sands capital management	2.92M	1.29%	$448.87M

Top Buyers

Holder	Shares	% Assets	Change
Millennium management	399.75K	0.02%	339.53K
Holocene advisors, lp	313.09K	0.12%	298.35K
Loomis sayles & co l p	255.52K	0.05%	255.52K
Morgan stanley	354.51K	0.00%	169.41K
Driehaus capital management	161.65K	0.20%	161.65K

Top Sellers

Holder	Shares	% Assets	Change
Alliancebernstein	39.72K	0.00%	-1.17M
Capital research global investors	1.51M	0.05%	-695.76K
Mackenzie financial	729.81K	0.15%	-426.14K
Fiera capital	-	-	-381.64K
Slate path capital lp	-	-	-365.40K

New Positions

Holder	Shares	% Assets	Change	Value
Loomis sayles & co l p	255.52K	0.05%	255.52K	$39.34M
Driehaus capital management	161.65K	0.20%	161.65K	$24.89M
Massachusetts financial services co /ma/	126.45K	0.01%	126.45K	$19.47M
Pfm health sciences, lp	88.16K	1.17%	88.16K	$13.57M
Norges bank	83.93K	0.00%	83.93K	$9.03M

Sold Out

Holder	Change
National bank of canada /fi/	-1.00
Coppell advisory solutions	-1.00
Innealta capital	-2.00
Financial gravity asset management	-2.00
Activest wealth management	-3.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
Jun 30, 2025	316	18.35%	35,390,802	-1.62%	112	0.86%	169	26.12%	93	9.41%
Mar 31, 2025	8	-96.69%	1,629,968	-95.25%	5	0.04%	4	-96.43%	4	-95.35%
Dec 31, 2024	147	-44.11%	24,053,140	-29.85%	76	0.64%	71	-47.79%	51	-23.88%
Sep 30, 2024	262	9.17%	34,287,771	-3.47%	109	0.84%	136	1.49%	66	4.76%
Jun 30, 2024	240	-10.45%	35,520,791	3.71%	114	0.94%	134	3.08%	63	-30.77%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
Sands Capital Global Growth Equity	2.65M	8.25%	-96.08K
Vanguard US Total Market Shares ETF	1.01M	3.21%	68.62K
Canada Life US Small-Mid Cap Growth A	1.00M	3.19%	-41.02K
Vanguard Total Stock Mkt Idx Inv	1.01M	3.13%	-26.84K
American Funds SMALLCAP World A	793.70K	2.49%	-700.00K
Vanguard Small Cap Index	774.60K	2.41%	-5.98K
iShares Russell 2000 ETF	770.00K	2.40%	-
Capital Group New Economy Comp	625.22K	1.96%	-
American Funds New Economy A	625.22K	1.96%	-
Artisan Mid Cap Investor	623.38K	1.95%	-28.10K

Recent Insider Transactions

Date	Name	Role	Activity	Value
Sep 03, 2025	Wilson Daniel G.	Chief Financial Officer	Sell	$875.00K
Sep 02, 2025	Wilson Daniel G.	Chief Financial Officer	Sell	$123.29K
Aug 22, 2025	Shrishrimal Sumi	EVP, Chief Risk Officer	Sell	$109.13K
Aug 11, 2025	Rosenbaum Marc Wade	Chief Accounting Officer	Sell	$35.92K
Aug 11, 2025	TALWALKAR ABHIJIT Y	-	Sell	$501.55K

Insider Transactions Trends

Date	Buy	Sell
2025 Q3	-	17
2025 Q2	-	8
2025 Q1	-	16
2024 Q4	1	2
2024 Q3	-	4

IRTC Ownership FAQ

Who Owns iRhythm?

iRhythm shareholders are primarily institutional investors at 112.03%, followed by 0.96% insiders and -12.99% retail investors. The average institutional ownership in iRhythm's industry, Medical Device Stocks, is 52.25%, which iRhythm exceeds.

Who owns the most shares of iRhythm?

iRhythm’s largest shareholders are Vanguard group (3.14M shares, 10.03%), Sands capital management (2.92M shares, 9.23%), and Blackrock funding, inc. /de (2.75M shares, 8.70%). Together, they hold 27.97% of iRhythm’s total shares outstanding.

Does Blackrock own iRhythm?

Yes, BlackRock owns 8.03% of iRhythm, totaling 2.5M shares as of Jun 2024. This represents 0.01% of BlackRock's total assets, with a market value of 269.35M$. In the last quarter, BlackRock increased its holdings by 61.23K shares, a 2.51% change.

Who is iRhythm’s biggest shareholder by percentage of total assets invested?

Ophir asset management pty is iRhythm’s biggest shareholder by percentage of total assets invested, with 4.50% of its assets in 202.08K iRhythm shares, valued at 28.31M$.

Who is the top mutual fund holder of iRhythm shares?

Sands Capital Global Growth Equity is the top mutual fund holder of iRhythm shares, with 8.25% of its total shares outstanding invested in 2.65M iRhythm shares.

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